Clyde Langer (Andrea Yates's universe)

Clyde Langer lived in a world in which Sarah Jane Smith died as child in 1964.

Biography
Due to the meddling of the Trickster, Andrea Yates's world was everchanging, and so Clyde lived in two similar but alternate timelines; one with Maria Jackson and one without.

Timeline with Maria Jackson
He was acquainted with Maria Jackson from school.

He bumped into Maria and her dad, Alan Jackson, at the skate park. Andrea Yates joined them as she was passing by. Alan showed off his skateboarding skills to Clyde and the group posed for photos.

The following day, Clyde received a phone call off Maria asking him if he knew where "Sarah Jane Smith" and "Luke Smith" were. When Maria mentioned that a meteor was heading for Earth, Clyde called her a nutter and hung up. (TV: Whatever Happened to Sarah Jane?)

Timeline without Maria Jackson
Clyde visited Andrea Yates's house for her birthday party, where he gave her a card.

Receiving a phone call from his friend Danny, Clyde was informed about approaching meteor K67. He turned on the television, which stated that there was no need to panic.

Upon hearing that the missile strike had failed to stop the meteor, Clyde and Chrissie Jackson ran outside. Clyde remained hopeful that something would stop it. (TV: Whatever Happened to Sarah Jane?)