Os and Didi think Stef made a huge mistake organizing a childish birthday party for Femke, but she loves 'catching up' as her busy parents never held one for her yet. Freddie and his ex both give her in-line skates. Stef and the gang enjoy the party games, but he soon regrets including hide and seek after wounding his knee, which bleeds alien-blue. This finally allows Ko to gather a DNA sample.
—KGF Vissers