Doctor Who Codexery

Adric

A mathematical genius whose final words questioned if he was ever right.

Adric was a fictional character portrayed by Matthew Waterhouse in Doctor Who, serving as a companion to both the Fourth and Fifth Doctors from 1980 to 1982. A native of Alzarius in the parallel universe of E-Space, he joined the crew after stowing away on the TARDIS during its time in that dimension. Known for his brilliant mathematical mind and distinctive star-shaped badge, Adric was often abrasive and arrogant due to his relative immaturity and desperate need for validation. Despite being one of the least popular companions among fans, his journey from a castaway seeking refuge to a tragic hero defines a pivotal era in the series.

Role
Companion
Home World
Alzarius (E-Space)
First Appearance
Full Circle
Final Appearance
Earthshock
Status
Deceased
Notable Trait
Mathematical Genius

Lore & Background

Adric hailed from Alzarius, a planet within E-Space where he belonged to a highly adaptable species capable of evolving to suit environments, though his specific substrain's full potential remained unknown. He possessed an inhumanly rapid healing rate but could not regenerate amputated parts. His personality was defined by a sharp intellect coupled with insecurity; the star-shaped badge he wore symbolized his excellence in mathematics, yet his inability to connect emotionally often led to friction with the Doctor and other companions like Romana and K9. While the Fourth Doctor respected Adric's mind, their relationship was strained by the boy's insubordination. This dynamic continued into the Fifth Doctor's era with new companions Nyssa and Tegan, where Adric remained a figure of tragic potential. His death in *Earthshock* left a deep mark on his friends; in *Time-Flight*, Tegan begged the Doctor to save him, but he refused to break the Laws of Time. Later, in *The Power of the Doctor*, a hologram of the Fifth Doctor confirmed that Adric was still remembered by the Thirteenth Doctor.

In Their Own Story

Adric first appeared in the serial *Full Circle* when he escaped a mistfall on Alzarius and found refuge in the TARDIS, which had entered E-Space via a Charged Vacuum Emboitment. He stowed away as the Doctor, Romana, and K9 Mark II departed, becoming a full companion in *State of Decay*. His travels ended tragically during *Earthshock* when he attempted to prevent a Cyberman-controlled freighter from crashing into Earth. The navigational controls were locked by logic codes, and Adric was entering the solution to the final code when a dying Cyberman destroyed the computer. He perished in the resulting crash, his last words being, "Now I'll never know if I was right." Unbeknownst to him, the freighter he tried to stop would later become the meteor that wiped out the dinosaurs. His death haunted the TARDIS crew; in *The Caves of Androzani*, Adric appeared as a hallucination at the end, and his name was the final word spoken by the Fifth Doctor before regenerating into the Sixth.

Reader's Guide

Adric's television tenure spanned 11 stories across 40 episodes during Seasons 18 and 19, with an illusion appearance in Season 21's *The Caves of Androzani*. His character was conceived by producer John Nathan-Turner as a "cosmic Artful Dodger" intended to be a roguish roughneck, though actor Matthew Waterhouse noted the role lacked consistent development. Beyond television, Adric appeared in the Virgin Missing Adventures novel *Cold Fusion* meeting the Seventh Doctor, and in *Divided Loyalties*. In Big Finish audio drama *The Boy That Time Forgot*, an older Adric was saved by a pocket dimension created by Block Transfer Computations; driven insane by isolation, he attempted to force Nyssa into marriage before forgiving the Doctor and dying again. In IDW's *Doctor Who: The Forgotten*, a manifestation of Adric saved the Tenth Doctor's life, stating it was "not a pointless death." He also appears as "Adric, Mathematical Genius" in Magic: the Gathering.

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