Markus is a fictional character portrayed by Randy Sklar in the TV series Phineas and Ferb.
In the first episode they appeared in, titled Cheers for Fears/Just Our Luck (season 4), they were 41 years old.
They appear in 1 episodes out of a total of 130 aired
Episodes1
Cheers for Fears/Just Our Luck
episode S4.E17 november 2013Candace asks for Phineas and Ferb's help making Jeremy's birthday gift.