S4 E1: Drain The Ocean

S4 E2: Stuntman

S4 E3: Build That Tune

S4 E4: Car of the Future and Old is New

S4 E5: Cut-Away

S4 E6: Bridge Too Far

S4 E7: Dragon Race and Grandscapes

S4 E8: Spooktacular

S4 E9: Blown Away

S4 E10: High Wire and Secret Cities

S4 E11: Window To The Future

S4 E12: Beginning, Middle & End

S4 E13: Sky's The Limit

S4 E14: The Grand Finale