Sergei Kushnarov

Sergei is a Russian Astronaut who appears in the episode "Mommy Can You Hear Me?". His career appeared to be dedicated to proving the existence of wormholes. He is introduced celebrating his birthday on an international space station with two other unnamed Russian astronauts while awaiting an expected greeting from Phineas and Ferb.

However, when Phineas and Ferb were set to send out the greeting, an RC helicopter with a Mindy Mimmick doll taped to it put together by Candace in an attempt to get Linda to see their contraption crash-landed into the microphone receiver. The recording of Candace saying, "Turn around", which were broadcasted to the astronauts brought to their attention that an asteroid was on a collision course with their satellite.

The evasive action they took sent them into a worm hole. Nothing is known about them after that, other than that 'somewhere beyond Jupiter, and beyond time' an aged Sergei on what we could assume was his death bed received his birthday greeting from an alien Ferb fetus.

Appearances

 * "Out to Launch"
 * "Wizard of Odd"
 * "Mommy Can You Hear Me?" (Name Revealed)