The Rocket With Two Brains

S2, E37: AVA misses her old friend QUESTY, the computer system on the inactive Quest One Space Station, so Hawk decides to take her there for a visit. Once aboard the station, QUESTY is overjoyed to hear AVA's voice again! While Hawk naps, the two computer programs chatter away and catch up on all the latest gossip. But when a bubble of hot plasma erupts off the Sun and sprays solar particles into space, they wash over the station and trigger a weird technical anomaly: both AVA and QUESTY are somehow merged inside Hawk's head. At first he tries to make the best of it... but their endless yammering keeps him awake at night, distracts him at work and play, and generally drives poor Hawk crazy. Finally he just can't take it anymore, and regretfully enlists Coot's help to separate the two programs from his aching brain.